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Square Head Bolts (ASME B18. 2.1)

Square Head Bolts were once the most common form of bolt, until they were replaced by hex head bolts. They are covered under ANSI Standard B18.2.1 and are now most commonly used for aesthetic purposes to provide a rustic look .

Square Head Bolt (b18.2.1), showing 200, (click on any line for more information)

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 3a307 gra square hd m/b low carb hdg b18.2.1150
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ASMCILSquare Head BoltGrade APlain1/2-13 x 1(ft) coarse a307 gra square hd m/b low carb b18.2.1260
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ASMCILSquare Head BoltGrade AGalvanized3/8-16 x 4a307 gra square hd m/b low carb hdg b18.2.1275
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ASMCILSquare Head BoltGrade APlain1/2-13 x 3(pt) coarse a307 gra square hd m/b low carb b18.2.125
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ASMCILSquare Head BoltGrade APlain1/2-13 x 5(pt) coarse a307 gra square hd m/b low carb b18.2.110
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ASMCILSquare Head BoltGrade AGalvanized5/8-11 x 3a307 gra square hd m/b low carb hdg b18.2.118
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ASMCILSquare Head BoltGrade AZinc/Clear7/8-9 x 4a307 gra square hd m/b low carb zp b18.2.124
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GLFOHSquare Head BoltGrade APlain3/8-16 x 33/8-16x3 square hd bolt a307 stl pln b18.2.1 () ()28
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GLFOHSquare Head BoltSteelPlain3/4-10 x 43/4-10x4 square hd bolt stl pln b18.2.1 () ()53
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GLFOHSquare Head BoltGrade 5Plain3/4-10 x 33/4-10x3 square hd bolt grade 5 stl pln b18.2.1 () ()79
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GLFOHSquare Head BoltGrade 8Plain3/4-10 x 33/4-10x3 square hd bolt grade 8 stl pln b18.2.1 () ()5
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GLFOHSquare Head BoltSteelPlain1/2-13 x 5 1/21/2-13x5-1/2 square hd bolt stl pln b18.2.1 310
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GLFOHSquare Head BoltGrade APlain1-8 x 41-8x4 square hd bolt a307 stl pln b18.2.1 3
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GLFOHSquare Head BoltGrade APlain1 1/4-7 x 101-1/4-7x10 square hd bolt a307 stl pln b18.2.1 40
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GLFOHSquare Head BoltGrade APlain3/4-10 x 73/4-10x7 square hd bolt a307 stl pln b18.2.1 10
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GLFOHSquare Head BoltGrade APlain3/4-10 x 6 1/23/4-10x6-1/2 square hd bolt a307 stl pln b18.2.1 1
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AbabaCASquare Head BoltSteelPlain3/8-16 x 5 1/23/8-16 x 5-1/2 sq hd bolt steel pln b18.2.1189
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AbabaCASquare Head BoltSteelPlain3/8-16 x 2 1/23/8-16 x 2 1/2 sq hd bolt steel pln b18.2.11
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AbabaCASquare Head BoltSteelPlain1/2-13 x 41/2-13 x 4 sq hd bolt steel pln b18.2.11
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AbabaCASquare Head BoltGrade 8Plain3/4-10 x 2 1/23/4-10 x 2-1/2 square head bolt gr.8 plain b18.2.130
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AbabaCASquare Head BoltSteelZinc/Clear3/4-10 x 2 3/43/4-10 x 2 3/4 sq hd bolt steel znc b18.2.1127
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AbabaCASquare Head BoltSteelZinc/Clear5/8-11 x 25/8-11 x 2 sq hd blt steel znc b18.2.16
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AbabaCASquare Head BoltSteelZinc/Clear5/8-11 x 2 1/25/8-11 x 2 1/2 sq hd blt steel znc b18.2.16
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AbabaCASquare Head BoltSteelPlain1/4-20 x 1 1/21/4-20 x 1 1/2 sq hd blt steel pln b18.2.1200
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AbabaCASquare Head BoltSteelPlain1/4-20 x 21/4-20 x 2 sq hd blt full thrd steel pln b18.2.12190
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AbabaCASquare Head BoltSteelZinc/Clear1/4-20 x 21/4-20 x 2 sq hd blt full thrd steel znc b18.2.1200
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QFCTXSquare Head BoltGrade AGalvanized3/8-16 x 3/43/8-16x3/4 square head bolt a307 hdg b18.2.1987
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 315/8-11x31 square head bolt a307 hdg 6 thd b18.2.12
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 335/8-11x33 square head bolt a307 hdg 6 thd b18.2.13
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 345/8-11x34 square head bolt a307 hdg 6 thd b18.2.13
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 375/8-11x37 square head bolt a307 hdg 6 thd b18.2.13
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 385/8-11x38 square head bolt a307 hdg 6 thd b18.2.12
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 555/8-11x55 square head bolt a307 hdg 6 thd b18.2.12
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 565/8-11x56 square head bolt a307 hdg 6 thd b18.2.12
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 585/8-11x58 square head bolt a307 hdg 6 thd b18.2.12
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QFCTXSquare Head BoltGrade AGalvanized5/8-11 x 635/8-11x63 square head bolt a307 hdg 6 thd b18.2.12
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 123/4-10x12 sq. head bolt a307 hdg b18.2.122
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 133/4-10x13 sq. head bolt a307 hdg b18.2.114
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 143/4-10x14 sq. hd bolt hdg a307 6 thd b18.2.130
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 153/4-10x15 square head bolt a307 hdg b18.2.130
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 163/4-10x16 square head bolt a307 hdg 6 thd b18.2.1237
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 163/4-10x16 square head bolt a307 hdg 6 thd b18.2.120
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 173/4-10x17 square head bolt a307 hdg 6 thd b18.2.137
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 183/4-10x18 square head bolt a307 hdg 6 thd b18.2.156
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 193/4-10x19 sq. head bolt a307 hdg 6 thd b18.2.140
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QFCTXSquare Head BoltGrade AGalvanized3/4-10 x 203/4-10x20 square head bolt a307 hdg 6 thd b18.2.16
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CascadeORSquare Head BoltSteelPlain3/4-10 x 3 1/2square m/b b18.2.157
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CascadeORSquare Head BoltSteelPlain7/8-9 x 12square m/b b18.2.19
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CascadeORSquare Head BoltSteelPlain5/8-11 x 7square m/b b18.2.113
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CascadeORSquare Head BoltSteelPlain5/8-11 x 8square m/b b18.2.124
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CascadeORSquare Head BoltSteelPlain1/4-20 x 1square m/b b18.2.1800
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B & K FASTPASquare Head BoltSteelGalvanized1/4-20 x 11/4-20 x 1 galv square bolts b18.2.179
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B & K FASTPASquare Head BoltSteelGalvanized1/4-20 x 1 1/21/4-20 x 1 1/2 galv square bolts b18.2.153
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B & K FASTPASquare Head BoltSteelGalvanized5/8-11 x 45/8-11 x 4 galv square bolts b18.2.1581
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B & K FASTPASquare Head BoltSteelGalvanized5/8-11 x 4 1/25/8-11 x 4 1/2 galv square bolts b18.2.123
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B & K FASTPASquare Head BoltSteelGalvanized3/4-10 x 7 1/23/4-10 x 7 1/2 galv square bolts b18.2.14
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B & K FASTPASquare Head BoltSteelGalvanized3/4-10 x 143/4-10 x 14 galv square bolts b18.2.11
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B & K FASTPASquare Head BoltSteelGalvanized7/8-9 x 167/8-9 x 16 galv square bolts 6 thread b18.2.132
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B & K FASTPASquare Head BoltSteelPlain1/4-20 x 5 1/21/4-20 x 5 1/2 square bolts plain b18.2.120
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B & K FASTPASquare Head BoltSteelPlain5/16-18 x 1 1/25/16-18 x 1 1/2 square bolts plain b18.2.11126
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B & K FASTPASquare Head BoltSteelPlain3/8-16 x 1 1/43/8-16 x 1 1/4 square bolts plain b18.2.16
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B & K FASTPASquare Head BoltSteelZinc/Clear3/8-16 x 1 1/43/8-16 x 1 1/4 square bolts zinc b18.2.1854
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B & K FASTPASquare Head BoltSteelPlain3/8-16 x 23/8-16 x 2 square bolts plain b18.2.1215
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B & K FASTPASquare Head BoltSteelPlain3/8-16 x 7 1/23/8-16 x 7 1/2 square bolts plain b 18.2.12
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B & K FASTPASquare Head BoltGrade 8Zinc/Yellow7/16-20 x 57/16-20 x 5 square bolts gr 8 z yellow b18.2.124
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 1 1/41/2-13 x 1 1/4 square bolts plain b18.2.12788
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 1 1/21/2-13 x 1 1/2 square bolts plain b18.2.1323
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B & K FASTPASquare Head BoltGrade 5Plain1/2-13 x 1 3/41/2-13 x 1 3/4 square bolts gr 5 plain b18.2.14
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 1 3/41/2-13 x 1 3/4 square bolts plain full thread b18.2.11
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 21/2-13 x 2 square bolts plain b18.2.1197
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B & K FASTPASquare Head BoltSteelPlain1/2-13 x 31/2-13 x 3 square bolts plain b18.2.1244
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JET FITTINGCASquare Head BoltSteelPlain5/16-18 x 3/4bolt square 5/1618x3/4 s b18.2.1600
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JET FITTINGCASquare Head BoltSteelPlain1/2-13 x 11/2-13x1 square machine bolts steel plain b18.2.1450
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JET FITTINGCASquare Head BoltGrade APlain5/16-18 x 3 1/25/16-18x3-1/2 (pt) square bolt steel a307 plain b18.2.1500
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JET FITTINGCASquare Head BoltGrade APlain3/8-16 x 1 3/43/8-16x1-3/4 (pt) square bolt steel a307 plain b18.2.1250
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JET FITTINGCASquare Head BoltGrade APlain3/8-16 x 2 3/43/8-16x2 3/4 (pt) bolts square head bolts a307 grade a square head bolt plain (inch) b18.2.1400
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JET FITTINGCASquare Head BoltGrade APlain3/8-16 x 53/8-16x5 (pt) bolts square head bolts a307 grade a square head bolt plain (inch) b18.2.1150
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JET FITTINGCASquare Head BoltGrade APlain1/2-13 x 3 1/21/2-13x3-1/2 (pt) square bolt steel a307 plain b18.2.154
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JET FITTINGCASquare Head BoltGrade APlain1/2-13 x 71/2-13x7 (pt) square bolt steel a307 plain b18.2.125
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JET FITTINGCASquare Head BoltGrade APlain5/8-11 x 3 1/25/8-11x3-1/2 (pt) square bolt steel a307 plain b18.2.195
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JET FITTINGCASquare Head BoltSteelBlack Oxide5/16-18 x 3/4bolt square 5/16-18x3/4 steel black oxide and wax b18.2.12000
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THRDFASTFLSquare Head BoltSteelGalvanized5/8-11 x 1square hd bolt hdg b18.2.1291
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THRDFASTFLSquare Head BoltSteelPlain1/2-13 x 3 1/2square hd bolt b18.2.1145
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THRDFASTFLSquare Head BoltSteelGalvanized1/2-13 x 1 1/4square hd bolt hdg b18.2.1112
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THRDFASTFLSquare Head BoltSteelGalvanized3/8-16 x 11square hd bolt hdg b18.2.1108
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THRDFASTFLSquare Head BoltSteelGalvanized5/8-11 x 2 1/2square hd bolt hdg b18.2.1100
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THRDFASTFLSquare Head BoltSteelGalvanized5/8-11 x 16 1/2square hd bolt hdg b18.2.147
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THRDFASTFLSquare Head BoltSteelGalvanized3/4-10 x 3square hd bolt hdg b18.2.120
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THRDFASTFLSquare Head BoltGrade 5Plain3/8-16 x 2gr5 square hd bolt b18.2.110
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THRDFASTFLSquare Head BoltSteelPlain3/8-16 x 2 1/2square hd bolt b18.2.13
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THRDFASTFLSquare Head BoltSteelGalvanized7/8-9 x 42square hd bolt rt6 hdg b18.2.1stock
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THRDFASTFLSquare Head BoltSteelGalvanized3/4-10 x 16square hd bolt hdg b18.2.124
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THRDFASTFLSquare Head BoltSteelGalvanized7/8-9 x 18square hd bolt rt6 hdg b18.2.110
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THRDFASTFLSquare Head BoltSteelPlain1/2-13 x 3 1/2square hd bolt b18.2.18
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THRDFASTFLSquare Head BoltSteelGalvanized7/8-9 x 22square hd bolt hdg b18.2.15
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THRDFASTFLSquare Head BoltSteelPlain5/8-11 x 18a-bolt w/nut & sq washer b18.2.15
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THRDFASTFLSquare Head BoltSteelPlain1 1/8-7 x 4 1/2square hd bolt b18.2.14
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THRDFASTFLSquare Head BoltSteelPlain5/8-11 x 3square hd bolt b18.2.13
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THRDFASTFLSquare Head BoltSteelGalvanized7/8-9 x 42square hd bolt rt6 hdg b18.2.13
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THRDFASTFLSquare Head BoltSteelGalvanized7/8-9 x 46square hd bolt rt6 hdg b18.2.13
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THRDFASTFLSquare Head BoltSteelPlain1 1/4-7 x 10square hd bolt b18.2.12
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